Objective function
The objective function of BLS can be flexibly changed rather than fixed. For different application backgrounds or goals, we can make the BLS perform better by modifying the objective function. At present, [1, 2] has improved the BLS performance by modifying the regular terms in the BLS objective function, which makes the BLS classification accuracy rate improved and the whole model more robust. In addition, [3] modified the objective function to make BLS obtain good progress in dealing with large-scale chaotic time series prediction problem.